diff --git a/app/assets/javascripts/filtered_search/add_extra_tokens_for_merge_requests.js b/app/assets/javascripts/filtered_search/add_extra_tokens_for_merge_requests.js
index 54ea936252e4e79128ae6eae6093050308bc8f33..0b24d9fc920ce64e590b68d1cd7efaf15ed23e5f 100644
--- a/app/assets/javascripts/filtered_search/add_extra_tokens_for_merge_requests.js
+++ b/app/assets/javascripts/filtered_search/add_extra_tokens_for_merge_requests.js
@@ -13,4 +13,16 @@ export default IssuableTokenKeys => {
 
   IssuableTokenKeys.tokenKeys.push(wipToken);
   IssuableTokenKeys.tokenKeysWithAlternative.push(wipToken);
+
+  const targetBranchToken = {
+    key: 'target-branch',
+    type: 'string',
+    param: '',
+    symbol: '',
+    icon: 'arrow-right',
+    tag: 'branch',
+  };
+
+  IssuableTokenKeys.tokenKeys.push(targetBranchToken);
+  IssuableTokenKeys.tokenKeysWithAlternative.push(targetBranchToken);
 };
diff --git a/app/assets/javascripts/filtered_search/available_dropdown_mappings.js b/app/assets/javascripts/filtered_search/available_dropdown_mappings.js
index e2f9c03ee650ecf99386a7cdfb04376a3805a340..be867a3838d02dfd49e3cb02a789a91a7519c474 100644
--- a/app/assets/javascripts/filtered_search/available_dropdown_mappings.js
+++ b/app/assets/javascripts/filtered_search/available_dropdown_mappings.js
@@ -5,6 +5,7 @@ import DropdownEmoji from './dropdown_emoji';
 import NullDropdown from './null_dropdown';
 import DropdownAjaxFilter from './dropdown_ajax_filter';
 import DropdownUtils from './dropdown_utils';
+import { mergeUrlParams } from '../lib/utils/url_utility';
 
 export default class AvailableDropdownMappings {
   constructor(container, baseEndpoint, groupsOnly, includeAncestorGroups, includeDescendantGroups) {
@@ -13,6 +14,7 @@ export default class AvailableDropdownMappings {
     this.groupsOnly = groupsOnly;
     this.includeAncestorGroups = includeAncestorGroups;
     this.includeDescendantGroups = includeDescendantGroups;
+    this.filteredSearchInput = this.container.querySelector('.filtered-search');
   }
 
   getAllowedMappings(supportedTokens) {
@@ -102,6 +104,15 @@ export default class AvailableDropdownMappings {
         },
         element: this.container.querySelector('#js-dropdown-runner-tag'),
       },
+      'target-branch': {
+        reference: null,
+        gl: DropdownNonUser,
+        extraArguments: {
+          endpoint: this.getMergeRequestTargetBranchesEndpoint(),
+          symbol: '',
+        },
+        element: this.container.querySelector('#js-dropdown-target-branch'),
+      },
     };
   }
 
@@ -130,4 +141,24 @@ export default class AvailableDropdownMappings {
   getRunnerTagsEndpoint() {
     return `${this.baseEndpoint}/admin/runners/tag_list.json`;
   }
+
+  getMergeRequestTargetBranchesEndpoint() {
+    const endpoint = `${gon.relative_url_root ||
+      ''}/autocomplete/merge_request_target_branches.json`;
+
+    const params = {
+      group_id: this.getGroupId(),
+      project_id: this.getProjectId(),
+    };
+
+    return mergeUrlParams(params, endpoint);
+  }
+
+  getGroupId() {
+    return this.filteredSearchInput.getAttribute('data-group-id') || '';
+  }
+
+  getProjectId() {
+    return this.filteredSearchInput.getAttribute('data-project-id') || '';
+  }
 }
diff --git a/app/assets/javascripts/filtered_search/filtered_search_manager.js b/app/assets/javascripts/filtered_search/filtered_search_manager.js
index 33c82778c79aa6d55e33db3972fc4e3233659b32..0c2e87521d964bbffaea05c1ff74c2147f91f5f3 100644
--- a/app/assets/javascripts/filtered_search/filtered_search_manager.js
+++ b/app/assets/javascripts/filtered_search/filtered_search_manager.js
@@ -504,14 +504,7 @@ export default class FilteredSearchManager {
         const match = this.filteredSearchTokenKeys.searchByKeyParam(keyParam);
 
         if (match) {
-          // Use lastIndexOf because the token key is allowed to contain underscore
-          // e.g. 'my_reaction' is the token key of 'my_reaction_emoji'
-          const lastIndexOf = keyParam.lastIndexOf('_');
-          let sanitizedKey = lastIndexOf !== -1 ? keyParam.slice(0, lastIndexOf) : keyParam;
-          // Replace underscore with hyphen in the sanitizedkey.
-          // e.g. 'my_reaction' => 'my-reaction'
-          sanitizedKey = sanitizedKey.replace('_', '-');
-          const { symbol } = match;
+          const { key, symbol } = match;
           let quotationsToUse = '';
 
           if (sanitizedValue.indexOf(' ') !== -1) {
@@ -520,10 +513,10 @@ export default class FilteredSearchManager {
           }
 
           hasFilteredSearch = true;
-          const canEdit = this.canEdit && this.canEdit(sanitizedKey, sanitizedValue);
+          const canEdit = this.canEdit && this.canEdit(key, sanitizedValue);
           const { uppercaseTokenName, capitalizeTokenValue } = match;
           FilteredSearchVisualTokens.addFilterVisualToken(
-            sanitizedKey,
+            key,
             `${symbol}${quotationsToUse}${sanitizedValue}${quotationsToUse}`,
             {
               canEdit,
diff --git a/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js b/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
index 7746908714e2ab513fb40f3cde4ce88edd9dd1d2..315cd6f64da2a657178ced521ee91c8a8b912327 100644
--- a/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
+++ b/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
@@ -69,11 +69,21 @@ export default class FilteredSearchVisualTokens {
   }
 
   static addVisualTokenElement(name, value, options = {}) {
-    const { isSearchTerm = false, canEdit, uppercaseTokenName, capitalizeTokenValue } = options;
+    const {
+      isSearchTerm = false,
+      canEdit,
+      uppercaseTokenName,
+      capitalizeTokenValue,
+      tokenClass = `search-token-${name.toLowerCase()}`,
+    } = options;
     const li = document.createElement('li');
     li.classList.add('js-visual-token');
     li.classList.add(isSearchTerm ? 'filtered-search-term' : 'filtered-search-token');
 
+    if (!isSearchTerm) {
+      li.classList.add(tokenClass);
+    }
+
     if (value) {
       li.innerHTML = FilteredSearchVisualTokens.createVisualTokenElementHTML({
         canEdit,
diff --git a/app/assets/stylesheets/framework/filters.scss b/app/assets/stylesheets/framework/filters.scss
index e5b529ae11d50d48085cbf6bb88c50d2e6ce19bc..5bcfd5d13226aa62979fd71dda87a490167f1ab6 100644
--- a/app/assets/stylesheets/framework/filters.scss
+++ b/app/assets/stylesheets/framework/filters.scss
@@ -108,6 +108,8 @@
   }
 
   .value-container {
+    display: flex;
+    align-items: center;
     background-color: $white-normal;
     color: $filter-value-text-color;
     border-radius: 0 2px 2px 0;
@@ -121,7 +123,7 @@
 
   .remove-token {
     display: inline-block;
-    padding-left: 4px;
+    padding-left: 8px;
     padding-right: 0;
 
     .fa-close {
@@ -412,3 +414,10 @@
   padding: 8px 16px;
   text-align: center;
 }
+
+.search-token-target-branch {
+  .value {
+    font-family: $monospace-font;
+    font-size: 13px;
+  }
+}
diff --git a/app/controllers/autocomplete_controller.rb b/app/controllers/autocomplete_controller.rb
index 0d5c8657c9eba40280b83fbd3d76e8df9060f01f..091327931c28aa289b53f4db4e8bc29734afaeb9 100644
--- a/app/controllers/autocomplete_controller.rb
+++ b/app/controllers/autocomplete_controller.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class AutocompleteController < ApplicationController
-  skip_before_action :authenticate_user!, only: [:users, :award_emojis]
+  skip_before_action :authenticate_user!, only: [:users, :award_emojis, :merge_request_target_branches]
 
   def users
     project = Autocomplete::ProjectFinder
@@ -38,4 +38,11 @@ class AutocompleteController < ApplicationController
   def award_emojis
     render json: AwardedEmojiFinder.new(current_user).execute
   end
+
+  def merge_request_target_branches
+    merge_requests = MergeRequestsFinder.new(current_user, params).execute
+    target_branches = merge_requests.recent_target_branches
+
+    render json: target_branches.map { |target_branch| { title: target_branch } }
+  end
 end
diff --git a/app/finders/merge_requests_finder.rb b/app/finders/merge_requests_finder.rb
index 93bee3f14880b8217a8fa9b1f53d243e5bda7a77..84689ff5dc77c9ffc65980079595980f58d95ea6 100644
--- a/app/finders/merge_requests_finder.rb
+++ b/app/finders/merge_requests_finder.rb
@@ -29,7 +29,7 @@
 #
 class MergeRequestsFinder < IssuableFinder
   def self.scalar_params
-    @scalar_params ||= super + [:wip]
+    @scalar_params ||= super + [:wip, :target_branch]
   end
 
   def klass
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index acf80addc6a0cb246e174d06fccef3448db31470..af8cb37bfb651aa2e43ade8df05699f084134f2e 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -203,6 +203,22 @@ class MergeRequest < ActiveRecord::Base
     '!'
   end
 
+  # Returns the top 100 target branches
+  #
+  # The returned value is a Array containing branch names
+  # sort by updated_at of merge request:
+  #
+  #     ['master', 'develop', 'production']
+  #
+  # limit - The maximum number of target branch to return.
+  def self.recent_target_branches(limit: 100)
+    group(:target_branch)
+      .select(:target_branch)
+      .reorder('MAX(merge_requests.updated_at) DESC')
+      .limit(limit)
+      .pluck(:target_branch)
+  end
+
   def rebase_in_progress?
     strong_memoize(:rebase_in_progress) do
       # The source project can be deleted
diff --git a/app/views/shared/issuable/_search_bar.html.haml b/app/views/shared/issuable/_search_bar.html.haml
index f43be304e6b0cce0a5382d58faa9a56568e757e5..2bcfcb6fa7c918ef32058ee3132f924056394a04 100644
--- a/app/views/shared/issuable/_search_bar.html.haml
+++ b/app/views/shared/issuable/_search_bar.html.haml
@@ -137,6 +137,11 @@
                 %li.filter-dropdown-item{ data: { value: 'no', capitalize: true } }
                   %button.btn.btn-link{ type: 'button' }
                     = _('No')
+            #js-dropdown-target-branch.filtered-search-input-dropdown-menu.dropdown-menu
+              %ul.filter-dropdown{ data: { dynamic: true, dropdown: true } }
+                %li.filter-dropdown-item
+                  %button.btn.btn-link.js-data-value.monospace
+                    {{title}}
 
             = render_if_exists 'shared/issuable/filter_weight', type: type
 
diff --git a/changelogs/unreleased/filter-merge-requests-by-target-branch.yml b/changelogs/unreleased/filter-merge-requests-by-target-branch.yml
new file mode 100644
index 0000000000000000000000000000000000000000..d0aba631c96a58af79b676e1f07eac92d3b0ed10
--- /dev/null
+++ b/changelogs/unreleased/filter-merge-requests-by-target-branch.yml
@@ -0,0 +1,5 @@
+---
+title: Add target branch filter to merge requests search bar
+merge_request: 24380
+author: Hiroyuki Sato
+type: added
diff --git a/config/routes.rb b/config/routes.rb
index 53c6225eff14f4ceaf1d1bcfe30f5d92d32ac44f..bbf002085455175fdc6a23de6cd9fcb12404cc7c 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -43,6 +43,7 @@ Rails.application.routes.draw do
   get '/autocomplete/users/:id' => 'autocomplete#user'
   get '/autocomplete/projects' => 'autocomplete#projects'
   get '/autocomplete/award_emojis' => 'autocomplete#award_emojis'
+  get '/autocomplete/merge_request_target_branches' => 'autocomplete#merge_request_target_branches'
 
   # Search
   get 'search' => 'search#show'
diff --git a/spec/controllers/autocomplete_controller_spec.rb b/spec/controllers/autocomplete_controller_spec.rb
index 4458a7223bfc4fc67c66b9dfc1a3db58eb270378..d8b75c5151e21fbe19c55a2c5c3382c3fc628816 100644
--- a/spec/controllers/autocomplete_controller_spec.rb
+++ b/spec/controllers/autocomplete_controller_spec.rb
@@ -371,5 +371,36 @@ describe AutocompleteController do
         expect(json_response[3]).to match('name' => 'thumbsdown')
       end
     end
+
+    context 'Get merge_request_target_branches' do
+      let(:user2) { create(:user) }
+      let!(:merge_request1) { create(:merge_request, source_project: project, target_branch: 'feature') }
+
+      context 'unauthorized user' do
+        it 'returns empty json' do
+          get :merge_request_target_branches
+
+          expect(json_response).to be_empty
+        end
+      end
+
+      context 'sign in as user without any accesible merge requests' do
+        it 'returns empty json' do
+          sign_in(user2)
+          get :merge_request_target_branches
+
+          expect(json_response).to be_empty
+        end
+      end
+
+      context 'sign in as user with a accesible merge request' do
+        it 'returns json' do
+          sign_in(user)
+          get :merge_request_target_branches
+
+          expect(json_response).to contain_exactly({ 'title' => 'feature' })
+        end
+      end
+    end
   end
 end
diff --git a/spec/features/merge_requests/user_filters_by_target_branch_spec.rb b/spec/features/merge_requests/user_filters_by_target_branch_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..ffbdacc68f6a7760bb0f59a8176edb4fa3b9123b
--- /dev/null
+++ b/spec/features/merge_requests/user_filters_by_target_branch_spec.rb
@@ -0,0 +1,45 @@
+require 'rails_helper'
+
+describe 'Merge Requests > User filters by target branch', :js do
+  include FilteredSearchHelpers
+
+  let!(:project) { create(:project, :public, :repository) }
+  let!(:user)    { project.creator }
+  let!(:mr1) { create(:merge_request, source_project: project, target_project: project, source_branch: 'feature', target_branch: 'master') }
+  let!(:mr2) { create(:merge_request, source_project: project, target_project: project, source_branch: 'feature', target_branch: 'merged-target') }
+
+  before do
+    sign_in(user)
+    visit project_merge_requests_path(project)
+  end
+
+  context 'filtering by target-branch:master' do
+    it 'applies the filter' do
+      input_filtered_search('target-branch:master')
+
+      expect(page).to have_issuable_counts(open: 1, closed: 0, all: 1)
+      expect(page).to have_content mr1.title
+      expect(page).not_to have_content mr2.title
+    end
+  end
+
+  context 'filtering by target-branch:merged-target' do
+    it 'applies the filter' do
+      input_filtered_search('target-branch:merged-target')
+
+      expect(page).to have_issuable_counts(open: 1, closed: 0, all: 1)
+      expect(page).not_to have_content mr1.title
+      expect(page).to have_content mr2.title
+    end
+  end
+
+  context 'filtering by target-branch:feature' do
+    it 'applies the filter' do
+      input_filtered_search('target-branch:feature')
+
+      expect(page).to have_issuable_counts(open: 0, closed: 0, all: 0)
+      expect(page).not_to have_content mr1.title
+      expect(page).not_to have_content mr2.title
+    end
+  end
+end
diff --git a/spec/finders/merge_requests_finder_spec.rb b/spec/finders/merge_requests_finder_spec.rb
index 503b88fcbadab826233ce4beb871474f8c3e97b3..f1178b07eecc7d6af11797a96d4bbdffda6570f2 100644
--- a/spec/finders/merge_requests_finder_spec.rb
+++ b/spec/finders/merge_requests_finder_spec.rb
@@ -36,7 +36,7 @@ describe MergeRequestsFinder do
     let(:project5) { create_project_without_n_plus_1(group: subgroup) }
     let(:project6) { create_project_without_n_plus_1(group: subgroup) }
 
-    let!(:merge_request1) { create(:merge_request, :simple, author: user, source_project: project2, target_project: project1) }
+    let!(:merge_request1) { create(:merge_request, author: user, source_project: project2, target_project: project1, target_branch: 'merged-target') }
     let!(:merge_request2) { create(:merge_request, :conflict, author: user, source_project: project2, target_project: project1, state: 'closed') }
     let!(:merge_request3) { create(:merge_request, :simple, author: user, source_project: project2, target_project: project2, state: 'locked', title: 'thing WIP thing') }
     let!(:merge_request4) { create(:merge_request, :simple, author: user, source_project: project3, target_project: project3, title: 'WIP thing') }
diff --git a/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js b/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js
index f3dc35552d5d9e7fa83eb35fd9e3f81f7cc1d06d..a72ea6ab5476e096ec677ab070c8af7c8d11bf19 100644
--- a/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js
+++ b/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js
@@ -293,6 +293,7 @@ describe('Filtered Search Visual Tokens', () => {
       subject.addVisualTokenElement('milestone');
       const token = tokensContainer.querySelector('.js-visual-token');
 
+      expect(token.classList.contains('search-token-milestone')).toEqual(true);
       expect(token.classList.contains('filtered-search-token')).toEqual(true);
       expect(token.querySelector('.name').innerText).toEqual('milestone');
       expect(token.querySelector('.value')).toEqual(null);
@@ -302,6 +303,7 @@ describe('Filtered Search Visual Tokens', () => {
       subject.addVisualTokenElement('label', 'Frontend');
       const token = tokensContainer.querySelector('.js-visual-token');
 
+      expect(token.classList.contains('search-token-label')).toEqual(true);
       expect(token.classList.contains('filtered-search-token')).toEqual(true);
       expect(token.querySelector('.name').innerText).toEqual('label');
       expect(token.querySelector('.value').innerText).toEqual('Frontend');
@@ -317,10 +319,12 @@ describe('Filtered Search Visual Tokens', () => {
       const labelToken = tokens[0];
       const assigneeToken = tokens[1];
 
+      expect(labelToken.classList.contains('search-token-label')).toEqual(true);
       expect(labelToken.classList.contains('filtered-search-token')).toEqual(true);
       expect(labelToken.querySelector('.name').innerText).toEqual('label');
       expect(labelToken.querySelector('.value').innerText).toEqual('Frontend');
 
+      expect(assigneeToken.classList.contains('search-token-assignee')).toEqual(true);
       expect(assigneeToken.classList.contains('filtered-search-token')).toEqual(true);
       expect(assigneeToken.querySelector('.name').innerText).toEqual('assignee');
       expect(assigneeToken.querySelector('.value').innerText).toEqual('@root');
diff --git a/spec/javascripts/helpers/filtered_search_spec_helper.js b/spec/javascripts/helpers/filtered_search_spec_helper.js
index 8933dd5def406fb2df89ed587554617220960679..fd06bb1f3244d30fae8c21d7940fac312cd9c44c 100644
--- a/spec/javascripts/helpers/filtered_search_spec_helper.js
+++ b/spec/javascripts/helpers/filtered_search_spec_helper.js
@@ -5,7 +5,7 @@ export default class FilteredSearchSpecHelper {
 
   static createFilterVisualToken(name, value, isSelected = false) {
     const li = document.createElement('li');
-    li.classList.add('js-visual-token', 'filtered-search-token');
+    li.classList.add('js-visual-token', 'filtered-search-token', `search-token-${name}`);
 
     li.innerHTML = `
       <div class="selectable ${isSelected ? 'selected' : ''}" role="button">
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 07cb4c9c1e3c0fd76bcf9c4dd231933723ff38a6..a35d3f14df8f0f07ad291e50144979f51a95908b 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -270,6 +270,25 @@ describe MergeRequest do
     end
   end
 
+  describe '.recent_target_branches' do
+    let(:project) { create(:project) }
+    let!(:merge_request1) { create(:merge_request, :opened, source_project: project, target_branch: 'feature') }
+    let!(:merge_request2) { create(:merge_request, :closed, source_project: project, target_branch: 'merge-test') }
+    let!(:merge_request3) { create(:merge_request, :opened, source_project: project, target_branch: 'fix') }
+    let!(:merge_request4) { create(:merge_request, :closed, source_project: project, target_branch: 'feature') }
+
+    before do
+      merge_request1.update_columns(updated_at: 1.day.since)
+      merge_request2.update_columns(updated_at: 2.days.since)
+      merge_request3.update_columns(updated_at: 3.days.since)
+      merge_request4.update_columns(updated_at: 4.days.since)
+    end
+
+    it 'returns target branches sort by updated at desc' do
+      expect(described_class.recent_target_branches).to match_array(['feature', 'merge-test', 'fix'])
+    end
+  end
+
   describe '#target_branch_sha' do
     let(:project) { create(:project, :repository) }